Coherent high-frequency axial oscillations in a partially magnetized direct current magnetron discharge
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arXiv
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| Format: | Preprint |
| Published: |
2023
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| _version_ | 1866913340619489280 |
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| author | Przybocki, Ryan C. Cappelli, Mark A. |
| author_facet | Przybocki, Ryan C. Cappelli, Mark A. |
| contents | High frequency oscillations are observed in a neon plasma of a direct current magnetron discharge. At low discharge currents, we see highly coherent 60 MHz fluctuations. Above a distinct current threshold, secondary 5 - 10 MHz fluctuations emerge in addition to turbulent fluctuations in the 60 - 100 MHz range. The oscillations in the total discharge current suggest axial wave propagation. A lower-hybrid wave theory is invoked to model the high frequency oscillations. We attribute the low frequency modes to a turbulence-driven inverse cascade process, as suggested by recent simulations. |
| format | Preprint |
| id |
arxiv_https___arxiv_org_abs_2309_13831 |
| institution | arXiv |
| publishDate | 2023 |
| record_format | arxiv |
| spellingShingle | Coherent high-frequency axial oscillations in a partially magnetized direct current magnetron discharge Przybocki, Ryan C. Cappelli, Mark A. Plasma Physics High frequency oscillations are observed in a neon plasma of a direct current magnetron discharge. At low discharge currents, we see highly coherent 60 MHz fluctuations. Above a distinct current threshold, secondary 5 - 10 MHz fluctuations emerge in addition to turbulent fluctuations in the 60 - 100 MHz range. The oscillations in the total discharge current suggest axial wave propagation. A lower-hybrid wave theory is invoked to model the high frequency oscillations. We attribute the low frequency modes to a turbulence-driven inverse cascade process, as suggested by recent simulations. |
| title | Coherent high-frequency axial oscillations in a partially magnetized direct current magnetron discharge |
| topic | Plasma Physics |
| url | https://arxiv.org/abs/2309.13831 |